CN203301393U - Non transformer single-phase grid connected inverter - Google Patents
Non transformer single-phase grid connected inverter Download PDFInfo
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- CN203301393U CN203301393U CN2013203846338U CN201320384633U CN203301393U CN 203301393 U CN203301393 U CN 203301393U CN 2013203846338 U CN2013203846338 U CN 2013203846338U CN 201320384633 U CN201320384633 U CN 201320384633U CN 203301393 U CN203301393 U CN 203301393U
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Abstract
The utility model provides a non transformer single-phase grid connected inverter, so as to solve the technical problem of large output common mode current, which is caused by large change of the sum of the common mode voltage of an output end, of the existing single-phase grid connected inverter, wherein the large change is caused by improper selection of the circuit topology and the control method. According to the technical scheme, a continuous flow branch comprises a fifth switch device, a sixth switch device, a seventh diode, an eighth diode, a ninth diode and a twelfth diode. The seventh diode and the eighth diode are connected in series and are in reverse parallel connection with both ends of the fifth switch device. The ninth diode and the twelfth diode are connected in series and are in reverse parallel connection with both ends of the sixth switch device. The negative pole of the seventh diode is connected with the negative pole of the ninth diode. The non transformer single-phase grid connected inverter has the advantages that the sum of the common mode voltage of the output end is constant; the output common mode current is very small, and at the same time the conversion efficiency of the single-phase grid connected inverter is high; a safety hidden danger is eliminated; and the loss is reduced.
Description
Technical field
The utility model belongs to the generating equipment technical field, relates to a kind of inverter, particularly a kind of transless type single-phase grid-connected inverter.
Background technology
Inverter especially combining inverter generally is divided into photovoltaic combining inverter, wind power-generating grid-connected inverter, power-equipment combining inverter and other generating equipment combining inverters, be used for realizing that direct current energy arrives the efficient conversion of AC energy, single-phase grid-connected inverter becomes the main flow in market now, wherein take transless type single-phase grid-connected inverter as main.If but transless type single-phase grid-connected inverter circuit topology and control method thereof select improper meeting that the common-mode voltage sum of output is changed greatly, can not remain a constant, thereby cause that the output common mode electric current is excessive, have potential safety hazard.
Summary of the invention
The purpose of this utility model is to select can not cause at that time the common-mode voltage sum of output to change greatly in order to solve existing single-phase grid-connected inverter at circuit topology and control method thereof, and then cause the excessive technical problem of output common mode electric current, in order to address this problem, the utility model proposes a kind of circuit topology of single-phase grid-connected inverter, make the common-mode voltage sum of single-phase grid-connected inverter output constant, when guaranteeing that the output common mode electric current is very little, make single-phase grid-connected inverter reach higher conversion efficiency.The utility model had both been eliminated potential safety hazard, had reduced again the loss of single-phase grid-connected inverter, had improved the performance of single-phase grid-connected inverter.
the concrete technical scheme that the utility model adopts is: a kind of transless type single-phase grid-connected inverter, comprise DC power supply, inversion module, and output module, key is: described inversion module comprises the first brachium pontis and the second brachium pontis that is connected between the DC power supply both positive and negative polarity, and afterflow branch road, the afterflow branch road comprises the 5th switching device, the 6th switching device, be connected in series and be connected anti-parallel to the 7th diode and the 8th diode at the 5th switching device two ends, be connected in series and be connected anti-parallel to the 9th diode and the tenth diode at the 6th switching device two ends, the negative pole of the 7th diode is connected with the negative pole of the 9th diode,
The first brachium pontis comprises the first switching device and the second switch device that is connected in series between the DC power supply both positive and negative polarity, and the forward output of the first switching device is connected with the forward output of the 5th switching device;
The second brachium pontis comprises the 3rd switching device and the 4th switching device that is connected in series between the DC power supply both positive and negative polarity, and the forward output of the 3rd switching device is connected with the forward output of the 6th switching device;
Output module comprises the first inductance, the second inductance and the second filter capacitor, the first end of the first inductance is connected in the mid point of the first brachium pontis, the first end of the second inductance is connected in the mid point of the second brachium pontis, the second end of the first inductance and the second end of the second inductance are connected to the two ends of AC load or civil power, and the second filter capacitor also is connected in the two ends of AC load or civil power.
The beneficial effects of the utility model are: the common-mode voltage sum of transless type single-phase grid-connected inverter output is constant, eliminated potential safety hazard, when guaranteeing that the output common mode electric current is very little, make transless type single-phase grid-connected inverter reach higher conversion efficiency.the 5th switching device of continuous current circuit and the 6th switching device not at Energy Transfer to the loop of electrical network, reduced the conduction loss of switching device, although increased the conduction loss of two diodes on continuous current circuit, but these two diodes can provide a kind of different continuous current circuit, especially can evade very high " the Haric topology " of efficiency in foreign patent, in addition, when power output is larger, output duty cycle is very large, especially when the peak value of electric current and valley, duty ratio surpasses 90%, this moment, time of afterflow was very short, so when power output is larger, the conduction loss accounting of the diode that increases is very little, so this circuit topology is when power output is larger, the conversion efficiency of transless type single-phase grid-connected inverter is greatly improved.
Description of drawings
Fig. 1 is circuit theory schematic diagram of the present utility model.
Fig. 2 be the utility model when the civil power positive half period, the current circuit schematic diagram when high frequency switching device is opened.
Fig. 3 be the utility model when the civil power positive half period, the current circuit schematic diagram when high frequency switching device turn-offs.
Fig. 4 be the utility model when the civil power negative half-cycle, the current circuit schematic diagram when high frequency switching device is opened.
Fig. 5 be the utility model when the civil power negative half-cycle, the current circuit schematic diagram when high frequency switching device turn-offs.
in accompanying drawing, Vdc represents DC power supply, D1 represents the first diode, D2 represents the second diode, D3 represents the 3rd diode, D4 represents the 4th diode, D5 represents the 5th diode, D6 represents the 6th diode, D7 represents the 7th diode, D8 represents the 8th diode, D9 represents the 9th diode, D10 represents the tenth diode, S1 represents the first switching device, S2 represents the second switch device, S3 represents the 3rd switching device, S4 represents the 4th switching device, S5 represents the 5th switching device, S6 represents the 6th switching device, L1 represents the first inductance, L2 represents the second inductance, C1 represents the first filter capacitor, C2 represents the second filter capacitor.
Embodiment
a kind of transless type single-phase grid-connected inverter, comprise DC power supply Vdc, inversion module, and output module, key is: described inversion module comprises the first brachium pontis and the second brachium pontis that is connected between DC power supply Vdc both positive and negative polarity, and afterflow branch road, the afterflow branch road comprises the 5th switching device S5, the 6th switching device S6, be connected in series and be connected anti-parallel to the 7th diode D7 and the 8th diode D8 at the 5th switching device S5 two ends, be connected in series and be connected anti-parallel to the 9th diode D9 and the tenth diode D10 at the 6th switching device S6 two ends, the negative pole of the 7th diode D7 is connected with the negative pole of the 9th diode D9,
The first brachium pontis comprises the first switching device S1 and the second switch device S2 that is connected in series between DC power supply Vdc both positive and negative polarity, and the forward output of the first switching device S1 is connected with the forward output of the 5th switching device S5;
The second brachium pontis comprises the 3rd switching device S3 and the 4th switching device S4 that is connected in series between DC power supply Vdc both positive and negative polarity, and the forward output of the 3rd switching device S3 is connected with the forward output of the 6th switching device S6;
Output module comprises the first inductance L 1, the second inductance L 2 and the second filter capacitor C2, the first end of the first inductance L 1 is connected in the mid point of the first brachium pontis, the first end of the second inductance L 2 is connected in the mid point of the second brachium pontis, the second end of the second end of the first inductance L 1 and the second inductance L 2 is connected to the two ends of AC load or civil power, and the second filter capacitor C2 also is connected in the two ends of AC load or civil power.
The equal reverse parallel connection in two ends of described the first switching device S1, second switch device S2, the 3rd switching device S3, the 4th switching device S4, the 5th switching device S5, the 6th switching device S6 has diode.
Described transless type single-phase grid-connected inverter also comprises the first filter capacitor C1 that is connected between DC power supply Vdc both positive and negative polarity.
Described six switching devices are insulated gate bipolar transistor IGBT, or are metal-oxide layer-semiconductor-field-effect transistor MOSFET.
When line voltage was positive half cycle, the driving signal of described the first switching device S1 and the 4th switching device S4 was high-frequency signal, and the driving signal of the 5th switching device S5 and the 6th switching device S6 is power frequency component.
When line voltage was negative half period, the driving signal of described the 3rd switching device S3 and second switch device S2 was high-frequency signal, and the driving signal of the 5th switching device S5 and the 6th switching device S6 is power frequency component.
Operation principle of the present utility model is: when line voltage is positive half cycle, the first switching device S1 is identical with the driving signal of the 4th switching device S4, it is all high-frequency signal, the 5th switching device S5 is identical with the driving signal of the 6th switching device S6, be all power frequency component, the 5th switching device S5 conducting all the time, the 6th switching device S6 turn-off all the time.When high frequency switching device was opened, electric current was from the positive pole of DC power supply Vdc, and the first switching device S1 that flows through, the first inductance L 1, AC load or civil power, the second inductance L 2, the 4th switching device S4, flow back into the negative pole of DC power supply Vdc, as shown in Figure 2.When high frequency switching device turn-offs, inductive current flow through the first inductance L 1, AC load or civil power, the second inductance L 2, the 9th diode D9, the 8th diode D8, the 5th switching device S5, as shown in Figure 3.
When line voltage is negative half period, the 3rd switching device S3 is identical with the driving signal of second switch device S2, it is all high-frequency signal, the 5th switching device S5 is identical with the driving signal of the 6th switching device S6, be all power frequency component, the 5th switching device S5 turn-offs all the time, the 6th switching device S6 is open-minded all the time.When high frequency switching device was opened, electric current was from the positive pole of DC power supply Vdc, and the 3rd switching device S3 that flows through, the second inductance L 2, AC load or civil power, the first inductance L 1, second switch device S2, flow back into the negative pole of DC power supply Vdc, as shown in Figure 4.When high frequency switching device turn-offs, inductive current flow through the second inductance L 2, AC load or civil power, the first inductance L 1, the 7th diode D7, the tenth diode D10, the 6th switching device S6, as shown in Figure 5.
The common-mode voltage sum of this transless type single-phase grid-connected inverter output is constant, when guaranteeing that the output common mode electric current is very little, makes transless type single-phase grid-connected inverter reach higher conversion efficiency.
Claims (4)
1. transless type single-phase grid-connected inverter, comprise DC power supply (Vdc), inversion module, and output module, it is characterized in that: described inversion module comprises the first brachium pontis and the second brachium pontis that is connected between DC power supply (Vdc) both positive and negative polarity, and afterflow branch road, the afterflow branch road comprises the 5th switching device (S5), the 6th switching device (S6), be connected in series and be connected anti-parallel to the 7th diode (D7) and the 8th diode (D8) at the 5th switching device (S5) two ends, be connected in series and be connected anti-parallel to the 9th diode (D9) and the tenth diode (D10) at the 6th switching device (S6) two ends, the negative pole of the 7th diode (D7) is connected with the negative pole of the 9th diode (D9),
The first brachium pontis comprises the first switching device (S1) and the second switch device (S2) that is connected in series between DC power supply (Vdc) both positive and negative polarity, and the forward output of the first switching device (S1) is connected with the forward output of the 5th switching device (S5);
The second brachium pontis comprises the 3rd switching device (S3) and the 4th switching device (S4) that is connected in series between DC power supply (Vdc) both positive and negative polarity, and the forward output of the 3rd switching device (S3) is connected with the forward output of the 6th switching device (S6);
Output module comprises the first inductance (L1), the second inductance (L2) and the second filter capacitor (C2), the first end of the first inductance (L1) is connected in the mid point of the first brachium pontis, the first end of the second inductance (L2) is connected in the mid point of the second brachium pontis, the second end of the second end of the first inductance (L1) and the second inductance (L2) is connected to the two ends of AC load or civil power, and the second filter capacitor (C2) also is connected in the two ends of AC load or civil power.
2. a kind of transless type single-phase grid-connected inverter according to claim 1, it is characterized in that: the equal reverse parallel connection in two ends of described the first switching device (S1), second switch device (S2), the 3rd switching device (S3), the 4th switching device (S4), the 5th switching device (S5), the 6th switching device (S6) has diode.
3. a kind of transless type single-phase grid-connected inverter according to claim 1, it is characterized in that: described transless type single-phase grid-connected inverter also comprises the first filter capacitor (C1) that is connected between DC power supply (Vdc) both positive and negative polarity.
4. a kind of transless type single-phase grid-connected inverter according to claim 1, it is characterized in that: described six switching devices are insulated gate bipolar transistor IGBT, or are metal-oxide layer-semiconductor-field-effect transistor MOSFET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203846338U CN203301393U (en) | 2013-06-28 | 2013-06-28 | Non transformer single-phase grid connected inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203846338U CN203301393U (en) | 2013-06-28 | 2013-06-28 | Non transformer single-phase grid connected inverter |
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| CN203301393U true CN203301393U (en) | 2013-11-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024404A (en) * | 2015-08-04 | 2015-11-04 | 新疆希望电子有限公司 | Novel single-input single-phase photo voltaic grid-connected inverter circuit |
| CN112054590A (en) * | 2020-09-04 | 2020-12-08 | 石家庄通合电子科技股份有限公司 | Capacitor direct-current guarantee power supply |
| CN115954938A (en) * | 2022-12-27 | 2023-04-11 | 深圳古瑞瓦特新能源有限公司 | Efficient is from grid-connected split-phase inverter circuit |
-
2013
- 2013-06-28 CN CN2013203846338U patent/CN203301393U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024404A (en) * | 2015-08-04 | 2015-11-04 | 新疆希望电子有限公司 | Novel single-input single-phase photo voltaic grid-connected inverter circuit |
| CN105024404B (en) * | 2015-08-04 | 2018-10-12 | 新疆希望电子有限公司 | A kind of New single-phase parallel network power generation inverter circuit |
| CN112054590A (en) * | 2020-09-04 | 2020-12-08 | 石家庄通合电子科技股份有限公司 | Capacitor direct-current guarantee power supply |
| CN115954938A (en) * | 2022-12-27 | 2023-04-11 | 深圳古瑞瓦特新能源有限公司 | Efficient is from grid-connected split-phase inverter circuit |
| CN115954938B (en) * | 2022-12-27 | 2024-04-09 | 深圳古瑞瓦特新能源有限公司 | Efficient off-grid split-phase inverter circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131120 |